Wall clock



FIG. 1 is a front elevational view of a wall clock showing my new design;

FIG. 2 is a right side elevational view of my new design, the top, bottom, and left side views being substantially similar thereto.

The rear of the claimed design is substantially plain and unornamented and has thereon a conventional clock mechanism. 

The ornamental design for a wall clock, as shown and described. 